diff --git a/navalplanner-business/src/main/java/org/navalplanner/business/planner/entities/StretchesFunction.java b/navalplanner-business/src/main/java/org/navalplanner/business/planner/entities/StretchesFunction.java
index 26e8b8d06..e89e7669f 100644
--- a/navalplanner-business/src/main/java/org/navalplanner/business/planner/entities/StretchesFunction.java
+++ b/navalplanner-business/src/main/java/org/navalplanner/business/planner/entities/StretchesFunction.java
@@ -187,6 +187,24 @@ public class StretchesFunction extends AssignmentFunction {
      */
     private Type desiredType;
 
+    public StretchesFunction copy() {
+        StretchesFunction result = StretchesFunction.create();
+        result.resetToStrechesFrom(this);
+        return result;
+    }
+
+    public void resetToStrechesFrom(StretchesFunction from) {
+        this.removeAllStretches();
+        for (Stretch each : from.getStretches()) {
+            Stretch newStretch = new Stretch();
+            newStretch.setDate(each.getDate());
+            newStretch.setLengthPercentage(each.getLengthPercentage());
+            newStretch.setAmountWorkPercentage(each
+                    .getAmountWorkPercentage());
+            this.addStretch(newStretch);
+        }
+    }
+
     public void setStretches(List<Stretch> stretches) {
         this.stretches = stretches;
     }
diff --git a/navalplanner-webapp/src/main/java/org/navalplanner/web/planner/allocation/streches/StretchesFunctionModel.java b/navalplanner-webapp/src/main/java/org/navalplanner/web/planner/allocation/streches/StretchesFunctionModel.java
index 34eae0696..417958841 100644
--- a/navalplanner-webapp/src/main/java/org/navalplanner/web/planner/allocation/streches/StretchesFunctionModel.java
+++ b/navalplanner-webapp/src/main/java/org/navalplanner/web/planner/allocation/streches/StretchesFunctionModel.java
@@ -91,7 +91,7 @@ public class StretchesFunctionModel implements IStretchesFunctionModel {
         if (stretchesFunction != null) {
             assignmentFunctionDAO.reattach(stretchesFunction);
             this.originalStretchesFunction = stretchesFunction;
-            this.stretchesFunction = copy(stretchesFunction);
+            this.stretchesFunction = stretchesFunction.copy();
 
             this.task = task;
             forceLoadTask();
@@ -106,25 +106,6 @@ public class StretchesFunctionModel implements IStretchesFunctionModel {
         task.getCalendar();
     }
 
-    private static StretchesFunction copy(StretchesFunction stretchesFunction) {
-        StretchesFunction copy = StretchesFunction.create();
-        copyStretches(stretchesFunction, copy);
-        return copy;
-    }
-
-    private static void copyStretches(StretchesFunction original,
-            StretchesFunction copy) {
-        copy.removeAllStretches();
-        for (Stretch stretch : original.getStretches()) {
-            Stretch newStretch = new Stretch();
-            newStretch.setDate(stretch.getDate());
-            newStretch.setLengthPercentage(stretch.getLengthPercentage());
-            newStretch.setAmountWorkPercentage(stretch
-                    .getAmountWorkPercentage());
-            copy.addStretch(newStretch);
-        }
-    }
-
     @Override
     public List<Stretch> getStretches() {
         if (stretchesFunction == null) {
@@ -152,7 +133,8 @@ public class StretchesFunctionModel implements IStretchesFunctionModel {
             }
 
             if (originalStretchesFunction != null) {
-                copyStretches(stretchesFunction, originalStretchesFunction);
+                originalStretchesFunction
+                        .resetToStrechesFrom(stretchesFunction);
                 stretchesFunction = originalStretchesFunction;
             }
         }